Relationship issues

I M18 have a gf and we have been together for 3 months now I have had past relationships were I have been used cheated on and other stuff and it has made me controlling jelous and obsessive but me and this girl are taking things serious and I don't wanna lose her because of how i am I wanna be better for her and some of it is cause of my insecurity's and past relationship trauma and childhood trauma it has gotten to the point we're in having panic attacks and exessive levels of stress and can't sleep at night